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Sulfur based corrosion inhibitors

By forming a durable protective barrier, sulfur-based corrosion inhibitors solve the problem of triazole corrosion inhibitors being sensitive to chlorine degradation and requiring residual inhibitors, achieving anti-corrosion effects without residue, reducing costs and monitoring frequency.

Inactive Publication Date: 2005-10-19
AKZO NOBEL NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These past studies focused on the degradation of residual inhibitors in solution and rarely addressed the sensitivity of the film itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Preparation of sodium dimethyldithiocarbamate in aqueous solution

[0127] A clean and dry four-necked 500 mL flask was charged with 59.6 g of tap water, 39.0 g (0.52 mol) of 60% dimethylamine in water, and a large stir bar. Stirring was started and the flask was fitted with a condenser, thermocouple and heating mantle. A 25 mL addition funnel was charged with 38.0 g (0.50 mol) of carbon disulfide and the addition funnel was loaded onto the reaction flask. A 50 mL addition funnel was charged with 40.0 g (0.50 mol) of 50% sodium hydroxide, which was then loaded onto the reaction flask. The reaction was then heated to 30°C with stirring.

[0128] When the contents of the reactor reached 30°C, the addition of carbon disulfide was started at a slow drop rate. After 5 minutes, sodium hydroxide was also added at a slow dropwise rate. The additions were adjusted so that the reaction temperature did not exceed 45°C, and after about 1 hour both additions were complete. The ...

Embodiment 2

[0130] Preparation of sodium diethyldithiocarbamate in aqueous solution

[0131] A clean dry four-neck 500 mL flask was charged with 113 g of tap water, 19.0 g (0.26 mol) of diethylamine, and a large stir bar. Stirring was started and the flask was fitted with a condenser, thermocouple and heating mantle. A 25 mL addition funnel was charged with 19.0 g (0.25 mol) of carbon disulfide, which was then loaded onto the reaction flask. A 50 mL addition funnel was charged with 20.0 g (0.50 mol) of 50% sodium hydroxide and the addition funnel was loaded onto the reaction flask. The reaction was then heated to 30°C with stirring.

[0132] When the contents of the reactor reached 30°C, the addition of carbon disulfide was started at a slow drop rate. After 5 minutes, sodium hydroxide was also added at a slow dropwise rate. The additions were adjusted so that the reaction temperature did not exceed 45°C, and after about 1 hour both additions were complete. The reaction was then boil...

Embodiment 3

[0134] Preparation of sodium dipropyldithiocarbamate in aqueous solution

[0135]A clean dry four-necked 500 mL flask was charged with 189 g of tap water, 36.9 g (0.365 mol) of dipropylamine (Aldrich, 99%), and a large stir bar. Stirring was started and the flask was fitted with a condenser, thermocouple and heating mantle. A 25 mL addition funnel was charged with 26.6 g (0.35 mol) of carbon disulfide, which was then loaded onto the reaction flask. A 50 mL addition funnel was charged with 28.0 g (0.35 mol) of 50% sodium hydroxide and the addition funnel was loaded onto the reaction flask. The reaction was then heated to 30 °C with stirring.

[0136] When the contents of the reactor reached 30°C, the addition of carbon disulfide was started at a slow drop rate. After 5 minutes, sodium hydroxide was also added at a slow dropwise rate. The additions were adjusted so that the reaction temperature did not exceed 45°C, and after about 1 hour both additions were complete. The re...

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Abstract

Alternative inhibitors that offer an improvement over tolyltriazole in inhibiting yellow metal corrosion. The dithiocarbamate compounds and their salts were compared to that of tolyltriazole under identical conditions. These comparative tests were conducted in common corrosion testing systems, using both electrochemical corrosion cells and pilot cooling rigs, using various water conditions. The test methods included electrochemical studies such as linear polarization resistance, open circuit potential versus time, Tafel and cyclic polarization.

Description

technical field [0001] The present invention relates to corrosion inhibitors. More specifically, the present invention relates to sulfur-based corrosion inhibitors for use in the corrosion inhibition of metals, especially in brass. [0002] Copper corrosion inhibitors are widely recognized as a major component in most water treatment formulations. The purpose of these inhibitors is to prevent corrosion of copper alloy surfaces in industrial cooling systems, especially at heat exchange surfaces. Accelerated corrosion of these surfaces and electrodeposition of copper on existing ferrous metal surfaces can adversely affect the structural integrity and operation of the cooling system. Therefore, copper corrosion inhibitors will always be a major component in most water treatment formulations. Background technique [0003] Benzotriazole ('BTA') and its derivatives have been the main corrosion inhibitors for brass in industry for at least the last three de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D295/20C07C333/16C23F11/16
CPCC23F11/16C23F11/162
Inventor E·C·瓦德A·L·小福斯特M·L·斯坦迪什I·C·维德纳
Owner AKZO NOBEL NV
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